Pulverizer and separator



Jan. 16, 1934. e. H. FRASER PULVERIZER AND SEPARATOK Filed Nov. 30, 1931INVENTOR fikm Patented Jan. 16, 1934 UNI-TED STATES PATENT OFFICEApplication November 30, 1931 Serial N0. 577,918

20 Claims.

This application is a continuation in part of my original application,Serial No. 26,033, filed April 27, 1925, patented December 1, 1931, No.1,834,095.

This invention relates to pulverizers and air separators for pulverizingmaterials and separating and collecting fine material, and aims toprovide improvements in such for use especially with mills of the ringand roll type in which the ring has an annular crushing face disposedabout a substantially horizontal axis.

In such devices as heretofore constructed the die has been rotativelymounted within and concentric of an enclosing casing constituting withit part of an endless current passage extending through the interior ofthe dieand to the suction side of an outside blower for exhausting airand fine material from inwardly of the die, and blowing the air and finematerial floating therein to an outside dust collector, the exhaust fromwhich is returned to such casing and sucked into the interior of thedie, for sucking fine material through the die and returning coarsematerial inwardly of the die, which constructions by making the interiorof the'die a part of the endless circuit through which the air iscirculated have afiected efliciency by subjecting the material to anoutblowing current during its pulverization within the die. 7

My present invention aims to improve pulverizing machines by avoidingcurrent molestation of the material within a die during pulverization,and to this end I preferably provide a current passage around andexternally of the die instead of through it, and discharge thepulverized material from the die into such external passage, andcirculate the outblowing current outwardly of the outer periphery of andaround circumferentially of the die to minimize entrance of currentwithin the latter, and I preferably provide a circular or spiral casingspaced around the die and having a peripheral tangential dischargeoutlet outwardly of the outer periphery of the die, to peripherallydischarge dust laden current outwardly of and tangentially from the dieand through such outlet, and I preferably provide a current inletoutwardly of and tangentially of the outer periphery of the die, forinletting cleaned current tangentially around instead of' axiallythrough the die, and I preferably provide a rolary blower around theouter periphery of die for centrifugally circulating such current aroundthe latter; and I preferably mount the die and the blower within andeccentric of such circular or spiral casing and intermediate saidtangential outlet and tangential inlet and adjacent the latter, and Ipreferably provide a partition wall adjacent the blower and intermediatesaid outlet and said inlet for defining the path of such current fromsuch blower to such outlet and from such inlet to such blower.

In my said original application I have shown a ring disposed in ahorizontal plane and affording in under, up through, and down around,such ring, an endless current passage, a blower 5 for circulating aseparating current in the form of a vortex ring through such passage,for floating fine material up through the ring, and a filter across suchpassage for intercepting fine material and conducting out of suchcurrent fine material floating in said passage, as distinguished fromthat part of my invention herein claimed, which aims to provide anendless current passage disposed around a horizontal axis, andexternally of instead of through the die, and outwardly of andcircumferentially around the periphery of and having eflluent andinfluent passages separated by the die, the die affording an inner wallfor such current passage, and I provide separating means in suchsuccessive to the so eflluent passage and precedent to the influentpassage, with blower means revolving around the outer periphery of thedie for circulating such current around its periphery to separate andfloat fine material from externally of the die through said passage andseparating means and returning cleaned current externally of the die, tothe end that the separating current shall not molest the material duringpulverization by-traversing the die axially as in my said originalapplication.

To this end in carrying out the preferred form of the part of myinvention to which this application pertains'I preferably provide acasing enclosing a blower chamber having a curved periphery disposedaround a horizontal axis and having peripheral eflluent and influentopenings connected by a current passage and affording a closed endlesscircuit, and I preferably provide a rotary die rotatable around ahorizontal axis and within and in spaced relation to the casing andintermediate the eflluent and influent openings thereof for affording aninner wall for such passage, and I preferably provide fan blades aroundthe outer periphery of and revolving with the die for drawing air intoand through 5 the influent passage and circulating it in the casing andblowing it through the'eifluent passage to cause it to circulate throughthe connecting passage and past the filter means and return cleaned airto the influent passage, and I preferably dispose the connecting passageabove the die and provide it with a grit well and a gravity chamberconnected to the supply for returning grit and coarse particles bygravity to the die, and with a volumetrically variable fine particlesettling chamber for returning by gravity fine particles to the supply,and with adjustable valve means for varying the speed of the current,and

with a dust filter for intercepting dust floating in the returningcurrent, and with a gravity dust discharge communicating through andextended externally without the connecting passage, for continuouslycirculating around the die fine material discharged radially of it, forblowing such material into the connecting passage, classifying it,returning oversize for further grinding, and removing the fine dust.

According to another feature of my said invention as claimed in thisapplication I preferably provide a rotary crushing ro ll having aperipheral crushing face within and eccentric of the annular crushingface of the die, and provide for tractionally revolving one of saidparts by the other by providing said parts at each side of the crushingfaces with axially resistant co-acting tractional drive faces wedginglyengaging to axially press said faces into tractional engagement to avoidslippage of said parts during their rotation, and I preferably providethree crushing rolls with crushing faces in the form of a segment of asphere so that they may rock slightly, and

mount them on inclinable shafts so that they may assume a slightrelative angularity to afford a slight friction or attrition effect incrushing the material between their crushing faces and that of the ring,and I preferably mount such shafts in inclinable bearings which mayberocked to compensate for any relative angular ity between the shafts;and I preferably rock such bearings in swinging bearing members whichare out-pressed by adjustable pressure springs and radially positionedby positioning springs in the plane of such adjustable springs and inthe plane and radially outward of the die, and I provide various otherfeatures of improvement all of which will be hereinafter more fully setforth with reference to the accompanying drawing in which Fig. 1 is afragmentary vertical longitudinal section of a pulverizing andseparating machine embodying the preferred form of the part of myinvention to which this application applies;

Fig. 2 is a fragmentary plan view thereof partly broken out to show thering and one of the lower rolls in axial section, and partly broken awayto show the connecting passage and the filter therein in horizontalsection;

Referring to Figs. 1 and 2 I will now describe that part of my saidinvention claimed herein.

Let A indicate the ring, B the upper roll, B the lower rolls, C thecasing, D the drive, E the feed supply, and F the fine outlet of apulverizing and separating machine, These parts may be of any usual orsuitable construction affording a crushing chamber and crushing elementstherein, which can co-operate to pulverize coarse infed material andseparate and withdraw pulverulent material. Either or both of thecrushing elements may revolve about a substantially horizontal axis, andcentrifugal force or other means may be used to generate crushing forcenecessary to pulverize the material between the reciprocal co-actingcrushing faces of these elements. As shown the ring A is a rotaryannular die mounted in the casing C and having an inner concave crushingface in the form of a segment of a sphere revolving in a substantialvertical plane, and the rolls B and B are radially movable and rotate onsubstantially horizontal axes and have peripheral crushing faces in theform of a segment of a sphere, within and eccentric of the ring andacting against its crushing face to crush material between these faces,the top roll being driven by the pulley D and tractionally. driving thering, which in turn tractionally drives the lower rolls, the materialentering through the supply chute E falling on the inner face of thering with which it revolves and against which it is crushed by therolls, and the crushed material flowing out past the sides of the ringand into the crushing chamber around it. Any number of rolls may beused, three being shown, and the ring may be supported and radiallypositioned in any suitable manner, preferably by mounting it on therolls and as shown by mounting the rolls on shafts A rotatably carriedin radially movable swinging bearing frames C .invention to which thisapplication pertains I preferably radially position each bearing frame Crelatively to the casing C independently of or additionally to itsadjustable pressurespring U, preferably by providing between the bearingframe C and easing C and around the pressure spring U a positioningspring h, preferably concentric of the spring U and preferably around itand radially of and in the plane of the ring A and reactant radially ofthe latter toward the casing C and the frame C for yieldingly resistinginward movement of the frame radially toward the casing independently ofthe adjustment of the pressure spring U.

According to another feature of the part of my invention to which thisapplication pertains I preferably yieldingly poise, confine andposition, the bearing frame C relatively to the casing (2 independentlyof the pressure spring U, preferably by providing a compression spring(2 between the bearing and the casing and radially reactant againstthese to radially resist inward movement of the bearing toward thecasing, and by providing a compression spring e outwardly of the bearingframe C and radially reactant inwardly toward such frame and outwardlytoward a radially adjustable nut g adjustable on a tension screw 1'traversing the springs d and e and connected to the outer casing C forresisting outward stress of the spring e, and for adjusting its inwardstress toward the frame C, for radially positioning and elasticallypoising the latter relatively to the casing C The springs 11 and e arepreferably at one side of the pressure spring U and extended radially ofthe casing C and are preferably disposed in the plane of the ring AAccording to one feature of the part of my said invention to which thisapplication pertains, the periphery of the outer casing (L is preferablysemi-circular and semi-spiral and disposed closes an inner blowerchamber J comprising a curved passage encircling the crushing elementsand having an upper eflluent K and a lower infiuent L, which are bothpreferably tangential of the periphery of the casing and are preferablyconnected by an intermediate connecting passage M, the blower chamberbeing disposed around and preferably eccentric of and spaced relativelyto the die, the outer periphery of which is preferably eccentric of andspaced inwardly from the periphery of the casing C and affords an innerwall for the curved passage and is disposed between the eliiuent K andthe infiuent L to cause the separating current to circulate through theconnecting passage M before returning to the infiuent L, and rotaryblower blades M preferably eccentric of the blower chamber J, andrevoluble about a horizontal axis and around and preferably mounted onthe periphery of and revolving with the die are mounted between the dieand the casing and project across the curved passage between them fordrawing the returning air in through the infiuent L and whirling it inthe blower chamber J toward the etlluent K to cause the air to floatfine material from around the periphery of the ring through the eflluentand the connecting passage M, without molesting the air within die orthe material being crushed therein.

According to another feature of my invention to which this applicationpertains I preferably provide the connecting passage M with a grit wellN for receiving large particles, and with a gravity chamber 0 forprecipitating medium particles into the well N, and with a gritrefeeding passage P for returning such particles to the supply E forrepulverization.

According to another feature of my invention to which this applicationpertains I preferably provide the connecting passage M with avolumetrically variable settling chamber Q in which fine particles may.settle, and with a refeeding chute R for returning such particles to thesupply E for repulverization, preferably by providing a verticallyadjustable damper wall I in the connecting passage M around its upperoutlet F, by vertically varying which the volumetric area of thesettling chamber Q may be varied to vary the speed of'the currentflowing through it to vary the size of the fine particles settlingtherein.

According to another feature of my said invention to which'thisapplication pertains I preferably provide the connecting passage with anadjustable valve T through which current through the connecting passagemay flow, for varying such current for varying the fineness ofseparation.

According to another feature of my said invention to which thisapplication pertains I preferably provide across the connecting passagedust intercepting means, as the successive staggered spaced troughs Whaving hollow faces opposed to the direction of fiow of the dust ladencurrent for forming current voids in which dust floating in such currentmay precipitate and descend out of the zone of the current, and Iprovide a dust receiver X below such troughs for receiving such dust andconducting it through the cleaned returning currentand discharging itexteriorly thereof to the dust outlet.

v When used in a mill of the type in'which the ring is disposedi'abouta'horizontal axis and is revolved by or revolves around rolls carried bymovable non-rotative members the part of my invention to which thisapplication pertains, provides for using slightly concave and convexperipheral crushing faceslthe ring A and the rolls B and B and axiallyresistant tractional engaging wedge shaped or tapering attritionco-operating tractional drive faces Q and It at each side of thecrushing faces of the ring and rolls, and

. for making the tapering faces of one of these minable limitsrelatively to the reciprocal faces on the ring.

Where the upper driving roll and the two lower rolls are used with arevolving ring, according to that part of my invention to which thisapplication pertains I preferably mount the driving roll on an axisparallel with the ring and mount the lower rolls on reversely inclinedaxes, each having a slight angularity or wind relatively to the axis ofthe upper roll.- as indicated in dotted lines for the inclined ends ofthe lower shafts in Fig. 1, so that one of the lower rolls tends todrive the ring slightly to one side and the other roll to a slightextent to the other side, thus balancing their side driving action, andaffording a slight friction or attrition effect between their grindingfaces and that of the ring, this I preferably accomplish by mounting thelower rolls on lower shafts which are slightly out of parallel, asindicated in dotted lines in Fig. 1.

Preferably according to the part of my said invention to which thisapplication pertains when applied to a traction die millthe revolvingfan blades M are mounted eccentric of the casing, preferably by-beingmounted on the periphery of the revolving die A so that the innerperiphery of the casing C affords a space similar to the spiral interiorof a blower casing,- to facilitate progress and discharge of the aircurrent, which is discharged upwardly at a point of greater-area, andfioats the dust with it into the settling chamher, where the grit isprecipitated'back into the crushing chamber and finer dust is carriedover the adjustable partition '1 into the selecting chamber Q, where'oversize is precipitated and the fineness desired escapes with the airthrough the central outlet S into the outer separating chamber V, whereit passes through the filter W to intercept the dust and send it to thedust outlet F while permitting the cleaned air to return to the downside of the blower chamber near the point where the path of the fanblades is narrowest. In such case the grit is returned by gravity to thecrushing elements.

In operation material to be'crushed will be entered through the supplyE, with the grit and oversize returned from the passage M, and thesewill be pulverized between the ring and rolls and discharged at thesides of the ring. The blower blades will drawv clean air through theinlet L and blow dust laden air through the outlet K, and the connectingpassage will grade and return the floating particles and fioat fine dustinto the separating chamber V, from which the airtinuous circulation ofthe air through this endless passage will permit separation of the dustas introduced and simultaneously return the coarse particles forrepulverization.

It will be seen that myinvention provides improvements which can bevariously and advantageously availed of, and it will be understood thatthe invention is not limited to the particular details of construction,arrangement, or combination of parts, set forth as constituting itspreferred form, since my improvements can be used in whole or in part,and according to any suitable desired modification, as the judgment ofthose skilled in the art may dictate, without departing from thespirit'of the invention.

The connecting passage may be any suitable passage between thetangential blast passage K and the tangential return passage L, and thewall J between the blast passage and the return passage may be of anysuitable shape to permit the current flowing from the blast passage tothe return passage to be cleaned of dust before reaching the returnpassage. The wall a which separates the blast and the current passagesis preferably concentric with and adjacent the outer peripheries of thefan blades, and the wall I) under the blast passage is preferably aninclined bottom wall or shelf for the grit well N to cause grit fallingon it to flow laterally to the grit opening P communicating with thesupply chute E, and the valve T can be any adjustable valve or damperfor varying the current space past the wall J and the current passageand the intermediate passage for receiving the tangential effluentcurrent and returning the tangential influent current may be as'simpleand direct as desired, but I prefer to form it between spaced concentricwalls J and X within a cylindrical overhead enclosing casing 2.

What I claim is:

1. In combination, a casing enclosing a crushing chamber, a rotatabledie within said chamber having an inner annular crushing face disposedaround a substantial horizontal axis, a movable and rotatable rollwithin and eccentric of said die and having a peripheral crushing faceacting toward said face to crush material between said faces, rotarymeans for rotating one of said parts, supply means for supplyingmaterial to be crushed to said faces, a movable bearing movably mountedon said casing and on which said roll is rotatably mounted, anadjustablespring for pressing said roll toward said die with anadjustable crushing pressure, and an additional spring around saidadjustable spring and between said casing and said bearing member,without and reactant inwardly toward said casing and inwardly of andreactant outwardly toward said bearing member, for positioning thelatter relatively to said casing additionally to said adjustable spring.

2. In combination, a casing enclosing'a crushing chamber, a rotatabledie within said chamber having an inner annular crushing face disposedaround a substantially horizontal axis, a movable and rotatable rollwithin and eccentric of said die and having a peripheral crushing faceacting toward said face to crush material between said faces, rotarymeans for rotating one of said parts, supply means for supplyingmaterial to be crushed to said faces, a movable bearing movably mountedon said casing and on which said roll is rotatably mounted, anadjustable spring for pressing said roll toward said die with anadjustable crushing pressure, and a spring adjacent and independent saidadjustable spring and intermediate said casing and said bearing member,radially of and without said casing and reactant inwardly toward saidcasing, and inwardly of and reactant outwardly toward said bearingmember, for positioning the latter and limiting its movement toward saidcasing.

3. In combination, a casing enclosing a crushing chamber, a rotatabledie within said chamber and having an inner annular crushing facedisposed around a substantially horizontal axis, a movable and rotatableroll within and eccentric of said die and having a peripheral crushingface acting toward said face to crush material between said faces,rotary means for retating one of said parts, supplying means forsupplying material to be crushed to said faces, a movable bearingmovably mounted on said casing and on which said roll is rotatablymounted, an adjustable spring for pressing said roll toward said diewith an adjustable crushing pressure, and a compression spring adjacentsaid adjustable spring and outwardly of said bearing member, radially ofand outwardly of said casing, and reactant inwardly toward said bearingmember for resisting outward movement of the latter and positioning saidbearing member relatively of said casing independently of saidadjustment spring.

4. In combination, a casing enclosing a crushing chamber, a rotatablecrushing die within said chamber and having an inner annular crushingface disposed about a substantially horizontal axis, a movable androtatable crushing roll within and eccentric of said die and having aperipheral crushing face acting toward said face to crush materialbetween said faces, rotary means for rotating one of said rotary parts,means for supplying material to be crushed to said faces, a swingingbearing member rotatably carrying said roll and swingably mounted onsaid casing, an adjustable pressure spring, for adjustably pressing saidroll toward said ring to generate a crushing pressure between saidfaces,

a compression spring between said casing and said swinging member, atone side of said swinging member and additional to said pressure spring,reactant toward said swinging member for yieldingly holding the latterin one direction, and a second additional compression spring at anotherside of said swinging member and reactant toward said swinging memberfor yieldingly.holding the latter toward an opposite direction, foryieldingly positioning the latter relatively to said casingindependently of said adjustable spring.

5. In combination, a casing enclosing a substantiallycircular chamber,disposed around a horizontal axis and having circumferentially spacedtangential peripheral discharge and inlet openings, an annular crushingdie having an outer periphery within and in spaced relation to saidcasing, and having an annular inner crushing face disposed about asubstantially horizontal axis, for crushing material within said die and1' discharging fine material into said chamber, a rotatable crushingroll within and eccentricof said die and having a peripheral crushingface acting toward said face to crush material between said faces, meansfor supplying material to be crushed to said faces, rotary means forrotating'said roll, and revoluble fan blades within and eccentric ofsaid chamber and around the periphery of said die and revoluble aroundsaid die and in said chamber for centrifugally circulating air therein,around the outer periphery of said die andfrom said tangentialinletthrough said tangential outlet, for floating such fine material aroundthe outer periphery of said die and for discharging such fine materialoutwardly of the outer periphery of said die and circumferentially ofsaid chamber through said tangential discharge opening.

6. In combination, a casing enclosing a crushing chamber, a rotatablecrushing die within said chamber and having an annular innercrushing-face disposed around a substantially horizontal axis, arotatable crushing roll within and eccentric of said die and having aperipheral crushing face acting toward said face to crush materialbetween said faces, supply means for supplying material to be crushed tosaid faces, rotary means for rotating one of said parts, and tractionaldrive means for tractionally driving one of said rotary parts from theother of said rotary parts comprising outwardly-beveled male tractionalfaces on the one and reciprocally beveled female traction faces on theother, said female faces in the axial plane of said male faces andwedgingly engaged by the latter, for tractionally drivingly grippingsaid faces 'to prevent peripheral slippage between said die and saidroll, said male traction faces and said female traction faces being theones axially yieldable relatively to the others, for yieldablytractionallyface disposed about a substantially horizontal axis andhaving an axially flared tractional face at each side of said crushingface, a rotatable crushing roll within and eccentric of said die andhaving a peripheral crushing face opposite said crushing face forcrushing material between said faces and having a reciprocally flaredtractional face at each side of said peripheral face, for tractionallyengaging said flared faces for tractionally driving said die roll theone from the other, drive means for rotating one of said rotary parts,supply means for supplying material to be crushed to said crushingfaces, said tractional faces of said roll being axially adjustablerelatively to said tractional faces of said die for adjustably spacingsaid tractional aces.

8. In combination, a casing enclosing a crushing chamber, a rotarycrushing dieinsaidchamber having an inner annular crushing face disposedabout a substantially horizontal axis, a rotatable crushing roll withinand eccentric of said die-and having a peripheral crushing face towardsaid face for crushing material between said faces, rotary means forrotating one of said parts, supply means for supplying material to becrushed to said faces, and guide means for relatively axially guidingsaid die and roll comprising axially flared side guide faces on saiddie, and similarly flared detachable side wedge guide faces de tachablycarried by said roll, said guide faces disposed at the sides of saidcrushing faces and in the axially plane of one another, and axiallyengageable for limiting realtive axial movement of said die and roll.

9. In combination, a casing enclosing a crushing chamber, a rotatablecrushing die within saidface toward said face for crushing materialbetween said faces, drive means for rotating one of said rotary parts,supply means for supplying materials to be crushed to said faces, saiddie having at each side of said inner crushing face a beveled tractionface, and said roll naving at each side of said peripheral face aseparate similarly beveled traction face, said traction faces axiallyinterengageable for limiting relative axial movement of said die androll, and a connection between said separate traction faces at the sidesof said roll extended axially of .said roll, for axially positioningsaid separate faces relatively to said roll.

10. In combination, a casing enclosing a crushing chamber, a rotarycrushing die in said chamber having an inner annular crushing facedisposed around a substantially horizontal axis, a

rotary crushing roll within and eccentric of said die and having aperipheral crushing face toward said face for crushing material betweensaid faces, means for rotating one of said rotary parts, means forsupplying material to be crushed to said faces, and means for axiallypositioning said die and roll comprising removable annular check ringsremovably bolted to said roll and having beveled edges in the axialplane of and at the sides of said die, for permitting relative axialmovement of said roll and die and for checking excessive relative axialmovement thereof.

11. In combination, a casing enclosing a crushing chamber, a rotary andaxially movable crushing die in said chamber having an inner annularcrushing face disposed about a substantially horizontal axis, a rotaryupper crushing roll within and eccentric of said die and having aperipheral crushing face toward said face for crushing material betweensaid faces, and on which face of said roll said die is axially movablymounted, rotary means for revolving one of said rotary parts, arotary'lower crushing roll within and eccentric of said' die and havinga peripheral crushing face toward said annular face for crushingmaterialbetween said faces, shaft means on which said lower roll is rotatablymounted, bearing means at the side lower of said roll and in which saidshaft means are rotatably mounted, for radially and axially positioningsaid lower roll, and means for checking axial movement of said dieaxially of said lower roll comprising beveled rotary removable annularcheck faces at each side of said peripheral crushing face of said lowerroll, and in the axial plane of and engageable with said die, forlimiting axial movement of said die relatively to said rolls. g r

12. In combination, a casing enclosing a substantially circular crushingchamber disposed around a substantially horizontal axis and havingperipheral spaced tangential outlet and inlet openings, a crushing diewithin and having an annular outer periphery spaced from said casing andhaving an annular inner crushing face disposed around a substantiallyhorizontal axis, for crushing material and for discharging finematerial. from said die into said chamber, a rotatable crushing rollwithin and eccentric of said die and having a peripheral crushing facetoward said face for crushing material between said faces, rotary meansfor revolving said roll, supply means for supplying material to becrushed to said faces, and rotary fan blades within and eccentric ofsaid chamber, intermediate said outlet and said inlet openings andaround the outer periphery of, said die, revoluble in the space betweenthe outer periphery of said die and said casing for causing a separatingcurrent to flow circumferentially around said die from said inletopening to said'outlet opening for floating fine materialcircumferentially of said chamber around and outwardly of the outerperiphery of said die and for discharging such fine material materialfrom said die into said chamber, a ro- 20- tatable crushing roll withinand eccentric of said die and having a peripheral crushing face towardsaid face for crushing material between said faces, supply means forsupplying material to be crushed to said faces, rotary means forrevolving said roll, and rotary fan blades within and eccentric of saidchamber and around said die revolving in the space between said die andsaid casing for causinga fluid current to circulate within andperipherally around said chamber and without and around the outerperiphery of said die from said inlet to said outlet to float finematerial outwardly of and around the outer periphery of said die andcircumferentially of said spiral chamber between said inletand saidoutlet, and for discharging such fine material tangentially from saidspiral chamber outwardly of the outer periphery of said die.

14. In combination, a casing enclosing a substantially circular crushingchamber disposed about asubstantially horizontal axis and having aperipheral tangential discharge outlet and a current inlet, a rotarycrushing die within said chamber having an outer periphery within and inspaced relation to said casing, and having an inner crushing facedisposed around a substantially horizontal axis, for receiving andcrushing material and for discharging fine material from said die intosaid chamber, a rotatable crushing roll within and eccentric of said dieand having a peripheral crushing face toward said face for crushingmaterial between said faces, a supply inlet for supplying material to becrushed to said faces, rotary means for rotating said die, and rotaryfan blades within and eccentric of said chamber and around the outerperiphery/of said die, revoluble in the space between said casing andsaid die, for causing a fluid current to enter said chamber through saidinlet and to flow circumferentially around said chamber outwardly of theouter periphery of said die, for floating fine materialcircumferentially around said chamber outwardly of the outer peripheryof said die and for discharging such fine material tangentially of saidchamber and outwardly of theouter periphery of said die through saidtangential discharge outlet.

15. In combination, a casing enclosing a substantially circular crushingchamber disposed around a substantially horizontal axis and having aperipheral tangential discharge outlet and a peripheral tangentialcurrent inlet, a rotary crushing die within said chamber and having anouter periphery within and in spaced relation to said casing, and havingan inner crushing face disposed around a substantially horizontal axisfor receiving material to be crushed and for discharging fine materialfrom said die into said chamber, a rotary crushing roll within andeccentric of said die and having a peripheral crushing face toward saidface for crushing material between said faces, supply means incommunication with said faces for supplying material to be crushed tosaid faces, rotary means for rotating said die, and rotary fan bladeswithin and eccentric of said chamber, and adjacent said inlet and aroundthe outer periphery of said die, revoluble in the space between theouter periphery of said die and said casing for causing a separatingcurrent to enter said chamber through said inlet and flow around andcircumferentially of said chamber outwardly of the outer periphery ofsaid die and through said outlet for floating fine materialcircumferentially around said chamber and outwardly of the outerperiphery of said die, and for discharging such fine materialery withinand in spaced relation to said casing and having an annular innercrushing face disposed around a substantially horizontal axis forreceiving material to be crushed and discharging crushed material aroundsaid die and into said chamber, a rotary crushing roll within andeccentric of said die and having a peripheral crusning face toward saidface for crushing material between said faces, rotary means in operativerelation to said roll, for rotating said roll, and rotary fan bladeswithin and eccentric of said char :1- ber and adjacent said inlet andaroundthe outer periphery of said die, revoluble around the sub--stantially horizontal axis and in the space between said casing and theouter periphery of said die, for causing a fluid current to enter saidchamber through said inlet and flow circumferentially around saidchamber and outwardly of the outer periphery of said die for floatingcrushed material circumferentially around said chamber outwardly of theouter periphery of said die, and for discharging such crushed materialthrough said tangential discharge'outlet tangentially of said chamberand outwardly of the outer periphery of said die.

1'7. In combination, a casing having a substantially circular peripheralwall enclosing a substantially circular crushing chamber disposed abouta substantially horizontal axis and having a tangential peripheraldischarge outlet, a crushing die within and spaced from said casing,having an outer periphery within said chamber and spaced inwardly fromsaid peripheral wall, and having an inner annular crushing face disposedaround a substantially horizontal axis, for receiving material to becrushed and for discharging crushed material at the side of said faceand outwardly into said chamber, a rotatable crushing roll within andeccentric of said die and having a peripheral crushing face toward saidface, for crushing material between said faces, supply means incommunication with said faces, for supplying material to be crushed bysaid faces, rotary means in operative relation to said roll, for ro-'tating said roll, and rotary fan blades within said chamber and aroundthe outer periphery of said die, rotatable around a substantiallyhorizontal axis and in the space between the inner periphery of saidcasing, and the outer periphery of said die, for causing a fluid currentto circulate around the inner periphery of said casing and outwardly ofthe outer periphery of said die for. floating crushed materialcircumferentially around the inner periphery of said casing, andoutwardly of the outer periphery of said die, and for tangentiallydischarging such flne material through said tangential discharge outletperipherally tangentially of said casing and outwardly of the outerperiphery of said die.

18. In combination, a casing having a substantially circular peripheralwall disposed around a substantially horizontal axis and env closing asubstantially circular crushing chamber having a peripheral tangentialdischarge outlet,

a rotatable crushing die within and in spaced relation to said casing,having an outer periphery within and spaced inwardly of the curvedperiphery of said casing and having an inner annular crushing facedisposed around a substantially horizontal axis, for receiving materialto be crushed and for discharging material outwardly past said die andinto said chamber, a rotatable crushing roll within and eccentric ofsaid die and having a peripheral crushing face toward said face forcrushing material between said faces, rotary means in operative relationto one of said rotary parts, for rotating said rotary parts, supplymeans in communication with said faces, for supplying material to becrushed by said faces, and rotary fan blades within said chamber andaround the outer periphery of said die, rotatable around a substantiallyhorizontal axis and .in the space between the periphery of said casingand the outer periphery of said die, for causing a fluid current tocirculate within and peripherally of said casing and around andoutwardly of the outer periphery of said die, for floating crushedmaterial within said chamber peripherally around the curved wall of saidcasing and outwardly of the outer periphery of said die and fortangentially discharging such fine material tangentially of saidchamberand peripherally of said curved wall and outwardly of the outerperiphery of said die through said tangential outlet.

19'. In combination, a casing having a curved peripheral outer walldisposed about a substantially horizontal axis and enclosing asubstantially circular crushing chamber having awcurrent inlet andhaving a peripheral tangential discharge outlet, a crushing die withinand in spaced relation from said casing, having an outer peripherywithin said chamber'and spaced inwardly from said curved periphery, andhaving an inner annular crushing face disposedaround a substantiallyhorizontal axis, for receiving material to be crushed and fordischarging crushed material outwardly across said die and into saidchamber, a rotatable crushing roll within and eccentric of said die andhaving a peripheral crushing face toward said face, for crushingmaterial between said faces, rotary means in operative relation to saidroll, for rotating said roll, supply means in communication with saidfaces, for supplying material to be crushed by said faces, and rotaryfan blades within said chamber and between said inlet and said outletand around the outer periphery of said die, rotatable around asubstantially horizontal axis and through the space between the curvedperiphery of said casing and the outer periphery of said die, forcausing a fluid current to enter said chamber through said inlet and tocirculate peripherally around said chamber within the curved peripheryof said casing and around the outer periphery of said die and'to outflowperipherally of said casing and tangentially of said chamber andoutwardly of the outer periphery of said-die through said tangentialoutlet, for floating crushed-material peripherally around the curvedwall of said casing. and outwardly of the outer periphery of said dieand for centrifugally tangentially discharging such fine material andsuch current outwardly of the outer periphery of said die andtangentially of said chamber through said tangential outlet.

20; In combination, a casing having a curved outer wall disposed about asubstantially horizontal axis and enclosing a substantially circularcrushing chamber having a tangential discharge outlet, a rotatablecrushing die, rotatable about a substantially horizontal axis and havingan outer periphery within said chamber and spaced inwardly from saidcurved wall, and having an inner annular crushing face for receivingmaterial to be crushed and for discharging crushed material outwardlypast said die and into said chamber, a rotatable crushing roll withinand eccentric of said die and having a peripheral crushing face towardsaid face for crushing material between said faces, rotary means inoperative relation to said die, for rotating said die, supply means incommunication with said faces, for supplying material to be crushed bysaid faces, and rotary fan blades within said chamber, inwardly of saidcurved wall and outwardly of the outer periphery of said die, andconcentric of and rotatable around said die, and through the spacebetween said curved wall and. the outer periphery of said die, forcausing a fluid current to flow peripherally around said chamber,circumferentially of said curved wall and outwardly of the outerperiphery of said die, for floating such crushed materialcircumferentially of said chamber and peripherally of said curved outerperiphery of said die, and for discharging such material tangentially ofsaid chamber and outwardly of the outer periphery of. said die throughsaid tangential discharge outlet.

GEORGE HOLT FRASER.

